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Several recent experiments have reported an anomalous temperature dependenceof the Coulomb drag effect in electron-hole bilayers. Motivated by thesepuzzling data, we study theoretically a low-density electron-hole bilayer,where electrons and holes avoid quantum degeneracy by forming excitonicmolecules. We describe the ionization-recombination crossover between theelectron-hole plasma and exciton gas and calculate both the intralayer and dragresistivity as a function of temperature. The latter exhibits a minimumfollowed by a sharp upturn at low temperatures in a qualitative agreement withthe experimental observations [see, e.g., J. A. Seamons et al., Phys. Rev.Lett. 102, 026804 (2009)]. Importantly, the drag resistivity in the proposedscenario is found to be rather insensitive to a mismatch in electron and holeconcentrations in sharp contrast to the scenario of electron-hole Cooperpairing.

Anomalous Coulomb Drag in Electron-Hole Bilayers due to the Formation of Excitons